Trolley



C. AALBORG.

TROLLEY.

APPLICATION FILED APR. I8, 1917.

1,384,418. w Patented July 12,1921.

2 SHEETS-SHEET I.

WITNESSES: INVENTOR 66 'r' 6? r/a zan Aa/borg ATTORNEY C. AALBORG.

THOLLEY.

APPLICATION FILED APR l8. 19w

1,384,41 8. 7 Patented July 12, 1921.

2 SHEETSSHEET Z.

.n'lL l \yy li/ Ki WITNESSES Z INVENTOR C/zr/M/anAa/bory.

UNITED STA'IEE RATENT OFFICE.

CHRISTIAN AALBORG, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL VANIA.

TBOLLEY.

Application filed April 18, 1917.

To all whom it may "concern Be it known that I, Cmus'riAN Aaliuono, a citizen of the United States, and a resident of lVilkinsburg, in the county of Alic gheny and State of Pennsylvania. have invented a new and useful lmprovement in Trolleys, of which the following is a specification.

My invention relates to pantograph trol lcys, and it has for its object to provide a trolley in which the contact pressure may be materially changed, under certain operatin" conditions.

eretofore, it has been found that a deposit of sleet or ice on a trolley wire occasions considerable diiliculty in the collection of current and results in pitting the current collector and burning the trolley wire. It has also been found that these diliiculties may be overcome by materially increasing the contact presslwe of the current-collecting shoe.

Accordinp to my invention, I provide fragmentary means associated with the elevating springs by which the contact pres sure on the trolley shoe may be materially changed when sleet or ice on the trolley wire renders this necessary.

Figure 1 is a side elevational view, partially in section, of a pantograph trolley constructed in accordance with my invention;

Fig. 2 is an enlarged fragmentary view of.

a portion of the trolley shown in Fig. 1; Fig. 3 is a top plan view of the device shown in Fig. 2; and Fig. 4 is an end sectional view, taken on line IV-IV of Fig. 3.

The trolley illustrated in the accompanying drawing is of a familiar type comprising a pantograph frame 1 that is provided with a eurrent-collecting shoe 2 and a plurality of elevating springs 3 and 4 which are adapted to raise the trolley l in any convenient manner. The trolley 1 is supported by insulators 5 and a frame 6, upon which a trolley-lowering device 7 is also mounted. The lower portions of the pantograph frame 1 are provided with arms 8 which are connected by a set of levers 9 to apply the lowering pressure from the device 7 to both sections of the pantograph frame.

The set of levers 9 is mounted upon a bracket 10 to which are also secured the ole voting springs 3 and 4. The central arm Specification of Letters Patent.

an eccentric shaft lb Patented July 12. 1921. Serial No. 162,998.

11 of the set of levers 5) is pivotally .i'nonnted' upon an upright arm 12, which, in turn, is pivotally mounted upon the bracket 10.

An improved form of spriuse-tensioning device 13 is mounted upon the upper end of the arm 12 and serves to connect the adja cent ends of the springs $5 and 4-. The spring-tensioning device 13 comprises link members H and 1-3 which are mounted upon that is adapted to be turned, in a convenient manner. to shorten the distance between the extreme ends of the links 14 and 15 and, since these links join the adjacent ends of the springs 3 and 4, this action increases the tension of the springs 25 and 1. The shaft 16 is mounted upon the arm 12 and is provided with oppositely disposed can) members 17 and 18. around which the members 11 and 15 are respectively disposed. Each of the link members 14 and 1+) is provided with an aperture 19 that is sufiiciently large to pen mit the complete rotation of the cam members 17 and 18 therein. Each of the cam members 17 and 18 is provided with a notch 20 with which projections 21 on the link members 14 and 15 are respectively adapted to engage to prevent the unintentional rotation of the shaft 16. The end of the shaft 16 is provided with a polygonal portion by which the shaft may be rotated.

During normal operation of a trolley con structed in accordance with my invention, the spring-tensioning device 13 occupies the position shown in Fig. 2, but if, by reason of sleet or ice collecting upon the trolley conductor, it is desired to increase the corn tact pressure of the trolley shoe, the shaft 16 of the spring-tensioning device is rotated through substantially 180, or until the cams 17 and '18 change relative positions. 'lhis materially shortens the distance between the extreme ends of the link members l4 and lo and incre ses the tension on the elevating springs 3 and 4. The shaft 16 is locked in this operative position by the engagement of the projections 21 with the notches 2U.

Although I have illustrated and described my invention as applied to a pantograph trolley employing two elevating springs, it

may obviously be employed with other types ofa *pair of actuating springs each having one of its ends connected to an adjusting member in spaced relation to the other spring, said adjusting member being mounted for rotation in a direction to vary the tension of the springs.

3. The combination with-a pantograph trolley, of a plurality of elevating springs, a link connected to each of said springs, and an eccentric camshaft interposed between said links and adapted to shorten the distance between the points of connection to said springs.

a. The combination with a trolley, of a pair of actuating springs each having one of its ends connected to an adjusting member in spaced relation to the other spring, said adjusting member being mounted for rotation about a center intermediate the said ends of the springs.

5. The combination -with a trolley, of a spring adapted to elevate said trolley, a link connected to said spring, a supporting membar, a cam shaft extending through said link and rotatably mounted on said supporting member, said cam shaft being adapted to occupy a plurality of positions to change the tension on said spring, and means for securing said shaft in any one of said positions.

(Sf-The combination with a pantogragh troll y, of springs adapted to elevate said tro ey, link members connecting the adjacent ends of said springs, and a shaft having a plurality connecting said link members and adapted to be rotated to change the distance between said link members,

7. The combination with a pantograph of eccentric cam surfacestrolley, of springs adapted to elevate said 7 trolley, link members connecting the adjacent ends of said springs, a shaft having a plurality of eccentric cam surfaces connecting said link members and adapt-ed to occupy a plurality of positions to change the distance between said springs, and means for securing said shaft in any one of said positions.

8. The combination with a trolley, of a plurality of actuating springs each of which has one of its ends eccentrically connected to a rotatable member in such manner that rotation of the said member will regulate the tension of the springs.

In testimony whereof, I have hereunto subscribed my name this 29th day of March,

CHRISTIAN AALBORG.

It is hereby certified that in Letters Patent No. 1,384,418, granted Julz 12,

192l, upon the application of Christian Aalborg, of Wilkinsburg, Pennsylvania,

for an improvement in Trolleys," an error appears in the printed specification reqiiiring correction as iollow: Page 1, 511524, strike out the word "fragmentary and that the said Letters Patent should be read with this correction therein that the same may conform to tho record 01' the case in the Patent Office.

Signed and sealed thi 4th day of October, A. D., 1921.

wilt KARL FENNING,

Acting Commissioner of Patenta. 

